Genetics

Genetics

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Genetics

relatedness

Biology; Genetics

Two clades are more closely related when they share a more recent common ancestor between them than they do with any other clade.

Joining of separate lineages on a phylogenetic tree, generally through hybridization or through lateral gene transfer. Fairly common in certain land plant clades; reticulation is thought to be rare ...

selection

Biology; Genetics

Process which favors one feature of organisms in a population over another feature found in the population. This occurs through differential reproduction—those with the favored feature produce more ...

sister group

Biology; Genetics

The two clades resulting from the splitting of a single lineage.

stasis

Biology; Genetics

A period of little or no discernible change in a lineage.

stem group

Biology; Genetics

All the taxa in a clade preceding a major cladogenesis event. They are often difficult to recognize because they may not possess synapomorpies found in the crown group.